The background color of postgraduate photos is generally required to be blue or white. For specific requirements, please refer to the enrollment regulations or notices of the schools you apply for. Different schools may have different requirements. When taking photos, you need to pay attention to the cleanliness of the background, and don't have sundries or other people who affect the quality of the photos. In addition, the size and resolution of the photos should also meet the requirements of the school, so as not to affect the audit.

If you need more specific information, please refer to the following suggestions:

Understand the requirements of the school: Different schools may have different requirements for photos, including background color, size, resolution and so on. So before taking pictures, you'd better know the specific requirements of the school you are applying for.

Choose an appropriate background color: Generally speaking, blue and white are common background color choices. It is recommended to use a solid background to ensure the clarity and quality of photos.

Pay attention to the quality of photos: the quality of photos directly affects the audit results, so you must pay attention to the choice of light and angle when taking photos to avoid blurring, dullness or distortion.

Ensure the authenticity of photos: photos should truly reflect the appearance characteristics of candidates, without any modification or beautification. If the photo is found to be fake, it may adversely affect the admission of candidates.

I hope the above suggestions can help you better prepare for the postgraduate entrance examination photos. Good luck in the exam!